Am I missing something? It's there in Firefox, at least on Linux - can't speak for Windows though.
However the print/save feature mentioned in TFA only applies to PDF documents... It doesn't allow you to directly save webpages as PDFs which was what I thought.
Nevertheless it's not possible to save webpages to pdf natively on Windows without software printers such as pdfcreator. That hasn't changed... but would be a nice feature :)